package com.txl.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.txl.domain.UserBean;

public class LoginFilter implements Filter {

	@Override
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		//获取登录用户
		UserBean user = (UserBean) request.getSession().getAttribute("user");
		if(user==null){
			//如果为空，则转发到全局消息显示页面
			request.setAttribute("message","您未登录");
			request.getRequestDispatcher("/message.jsp").forward(request, response);
		}else{
			//如果不为空，则放行
			chain.doFilter(request, response);
		}
	}
	
	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}
